07-21-2017
You know that it won't work reliably as given in your post#5? With that date format, January 2018 is less (earlier) than December 2017.
And, you don't need the $(date) for the date arithmetics. date assumes NOW when differences are given.
The trick with the one line printout of the commands for sh is a good one...
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LEARN ABOUT PHP
datetime.setisodate
DATETIME.SETISODATE(3) 1 DATETIME.SETISODATE(3)
DateTime::setISODate - Sets the ISO date
Object oriented style
SYNOPSIS
public DateTime DateTime::setISODate (int $year, int $week, [int $day = 1])
DESCRIPTION
Procedural style
DateTime date_isodate_set (DateTime $object, int $year, int $week, [int $day = 1])
Set a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.
PARAMETERS
o $object
-Procedural style only: A DateTime object returned by date_create(3). The function modifies this object.
o $year
- Year of the date.
o $week
- Week of the date.
o $day
- Offset from the first day of the week.
RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | Changed the return value on success from NULL to |
| | DateTime. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
DateTime.setISODate(3) example
Object oriented style
<?php
$date = new DateTime();
$date->setISODate(2008, 2);
echo $date->format('Y-m-d') . "
";
$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "
";
?>
Procedural style
<?php
$date = date_create();
date_isodate_set($date, 2008, 2);
echo date_format($date, 'Y-m-d') . "
";
date_isodate_set($date, 2008, 2, 7);
echo date_format($date, 'Y-m-d') . "
";
?>
The above examples will output:
2008-01-07
2008-01-13
Example #2
Values exceeding ranges are added to their parent values
<?php
$date = new DateTime();
$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "
";
$date->setISODate(2008, 2, 8);
echo $date->format('Y-m-d') . "
";
$date->setISODate(2008, 53, 7);
echo $date->format('Y-m-d') . "
";
?>
The above example will output:
2008-01-13
2008-01-14
2009-01-04
Example #3
Finding the month a week is in
<?php
$date = new DateTime();
$date->setISODate(2008, 14);
echo $date->format('n');
?>
The above examples will output:
3
SEE ALSO
DateTime.setDate(3), DateTime.setTime(3).
PHP Documentation Group DATETIME.SETISODATE(3)